Film



Patented Feb. 23, 1937 FILM Max Hagedorn and Armin ()ssenbrunner, Dessau in Anhalt, and Gustav Wiimanns, Wolfen Kreis Bitterfeld, Germany, assignors to Agfa Ansco Corporation, Binghamton, N. Y., a corporation of New York No Drawing. Application March 2, 1934, Serial No. 713,771. In Germany March 4, 1933 4 Claims. (Cl. 106-40) Our present invention relates to the manufacture of film.

One of its objects is to provide a process for the manufacture of film having improved mechanical properties. Another object is the improved film. Further objects will be seen from the detailed specification following hereafter.

According to this invention it has been found that compounds having no dissolving action on cellulose esters and which are derived from the cent. of acetic acid is dissolved in a mixture of methylene chloride, chloroform and amyl alcohol in the proportions of 2:512 toa solution of 18 per cent strength while adding 20 per cent of the alcohols obtained by oxidizing commercial paramn. The solution obtained is cast to form a film of 0.135 mm. thickness. This film shows the following data in comparison with a film prepared with trip-henylphosphate, the usual softener for acetylcellulose.

paraflins and the high boiling carbon hydrates available in nature, are particularly suited as Kind omddition Breaking Elongation, Creasing softening agents for organic cellulose esters and load,k11o percent number mixed organic and inorganic cellulose esters, for

15 instance, cellulose acetate, cellulose nitroacetate, 20 per cent of alcohols oband cellulose acetobutyrate. The softening gg g gff f?f: 88 42 335 agents according to this invention are the esters pe t o y -p of monovalent alcohols with fatty acids or the phflte 89 37 191 alcohols which are obtainable by oxidation of the 20 above mentioned parafiins and high boiling hy- Example a 59111131011 Of 180 grams Q drocarbons, such as are resulting in the hydro- 1111056 acetobutymte 1I1 320 grams o a m ture genation under pressure of coal or brown coal, or of acetone and alcohol 111 the ratlo 332 thelfe are in cracking the hydrocarbons contained in the added 36 gFams buty1e5Fe1Pf the mlxtulje high boiling fractions. In view of the heteroof iotty golds b o hgmte wax by 0x1- 5 geneity of the starting material, the fatty acids datum Wlth Chromlum acldo thls l m' or the alcohols are obtained in form of mixtures there 15 Cast film 0f 0 to 25 1t thlckness which in which may differ in accordance with difierent w 9 its Pflecham'cal plPperties as Q oxidizing processes They contain an elastlcity, extensibility and creasing number is arborescent carbon chains and therefore difier much better adaptefi for lnsulatlflgfilectllc 0011- 30 principally from the natural fatty acids or the ouotors than l Wltholll' Fi add-1171911 0f Softenalcohols obtainable from the fatty acids by reducmg agent With the addltlon 0f tllpljlenylllhostion. If the esters shall be suitable for the manu- Phate P trlcresylphosphate phthallc acld facture of supports for photographic layers they ters hltherto must not contain strongly smelling compounds. What We 0131111151 35 For the purposes of the invention there are par- A of u actur ng film wh ch comticularly suited the esters which are derived from pllses S O Vlng Cellulose acetate containing 56 fatty acids having an unbmnched Chain of t per cent of acetic acid in a mixture of methylene least 8 carbon atoms or the alcohols having an Chloride, chloroform and alcohol, adding a m unbranched chain of at least 8 carbon atoms. tul'e alcohols Obtained y oxidizing commer- 40 The lower esters or alcohols are not so useful filial paraffin and casting e fi from t S0111- because they have a high vapor pressure and therefore are very volatile. The softening agents A film which C p s Cellu ose acetate conprepared by oxidizing paraffins such as lignite taining 56 per cent of acetic acid and a mixture wax and ozocerite, or the high boiling brown coal f alcohols obtained y oxidizing mmercial 45 oils by means of air (with or without a catalyzer) p mfi nitric acid or chromic acid are preferred without Process of manufacturing fi w ch comlimiting the invention. prises dissolving in a suitable solvent therefor a The following examples serve to illustrate the Co p u d Se ected from the group Consisting of invention: organic acid esters of cellulose and mixed or- 50 Example 1.-Acetylcellulose containing 56 per game-inorganic acid esters of cellulose, adding thereto a non-solvent mixture of alcohols obtained by oxidizing a hydrocarbon mixture selected from the group consisting of paraffin wax, lignite wax, ozocerite, and high-boiling hydrocarbons of the type of brown coal oils, most of said alcohols having an arborescent chain of carbon atoms, and casting the film from this solution 4. A cast film comprising a compound selected from the group consisting of organic acid esters 10 of cellulose and mixed organic-inorganic acid esters of cellulose in admixture with a non-solvent mixture of alcohols obtained by oxidizing a hydrocarbon mixture selected from the group consisting of paraflin wax, lignite wax, ozocerite, and high boiling hydrocarbons of the type of brown coal oils, most of said alcohols having an arborescent chain of carbon atoms.

MAX HAGEDORN.

ARMIN OSSENBRUNNER.

GUSTAV WILMANNS. 

